‘April showers bring May flowers,’ or so the saying goes. Like Groundhog Day or dozens of sayings you can find cataloged in a Farmer’s Almanac, it’s part of the weather-related folklore that’s been passed down for generations. They hold some truth.
But most meteorologists prefer more scientific observations. For long-term forecasting, the ENSO - or "El Niño Southern Oscillation" - provides some of the most reliable guidance on what kind of weather to expect in winter.